Find the unknown in the proportion

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?